/**
 * Copyright 2013-2020 the original author or authors from the JHipster project.
 *
 * This file is part of the JHipster project, see http://www.jhipster.tech/
 * for more information.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const { isReservedFieldName } = require('../jhipster/reserved-keywords');
const { merge } = require('../utils/object-utils');

module.exports = class JDLField {
    constructor(args) {
        const merged = merge(defaults(), args);
        if (!merged.name || !merged.type) {
            throw new Error('The field name and type are mandatory to create a field.');
        }
        if (isReservedFieldName(merged.name)) {
            throw new Error(`The field name cannot be a reserved keyword, got: ${merged.name}.`);
        }
        this.name = merged.name;
        this.type = merged.type;
        this.comment = merged.comment;
        this.validations = merged.validations;
        this.options = merged.options;
    }

    addValidation(validation) {
        if (!validation) {
            throw new Error("Can't add a nil JDL validation to the JDL field.");
        }
        this.validations[validation.name] = validation;
    }

    forEachValidation(functionToApply) {
        if (!functionToApply) {
            throw new Error('A function must be passed to iterate over validations');
        }
        Object.values(this.validations).forEach(functionToApply);
    }

    validationQuantity() {
        return Object.keys(this.validations).length;
    }

    forEachOption(functionToApply) {
        if (!functionToApply) {
            throw new Error('A function must be passed to iterate over options');
        }
        Object.entries(this.options).forEach(functionToApply);
    }

    optionQuantity() {
        return Object.keys(this.options).length;
    }

    toString() {
        let string = '';
        if (this.comment) {
            string += `/**\n${this.comment
                .split('\n')
                .map(line => ` * ${line}\n`)
                .join('')} */\n`;
        }
        string += `${this.name} ${this.type}`;
        Object.keys(this.validations).forEach(validationName => {
            string += ` ${this.validations[validationName].toString()}`;
        });
        return string;
    }
};

function defaults() {
    return {
        validations: {},
        options: {},
    };
}
